"In Ohio — which no Republican has won the presidency without — Mr. Obama is leading Mr. Romney 53 percent to 43 percent in the poll. In Florida, the president leads Mr. Romney 53 to 44 percent in the poll.

"The surveys, which had margins of sampling error of plus or minus three percentage points for each candidate, also included a Pennsylvania poll, where Mr. Obama is leading Mr. Romney by 12 percentage points."